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Mechanisms of the formation of wind-blown sand hazards and the sand control measures in Gobi areas under extremely strong winds along the Lanzhou-Xinjiang high-speed railway

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Science China Earth Sciences 2023年第2期66卷 292-302页

作者： Jianjun QU Tao WANG Qinghe NIU Benli LIU Lihai TAN Qingjie HAN Yang GAO jianhua xiao Key Laboratory of Desert and Desertification/Dunhuang Gobi and Desert Ecology and Environment Research Station Northwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesLanzhou730000China Southern Marine Science and Engineering Guangdong Laboratory(Guangzhou) Guangzhou511458China

The Lanzhou-Xinjiang high-speed railway(HSR)traverses areas of the Gobi Desert where extremely strong winds are *** strong winds cause sand/gravel hazards,an unaddressed issue that often seriously compromises the safe operation of the *** paper studies the mechanisms leading to wind-blown sand hazards and the outcomes of sand control projects in these *** main findings are as follows:(1)Cold northern airflows over the Tian Shan mountain range are accelerated by the wind tunnels and downslope effect as they pass over complex terrain comprising passes,gullies,and proluvial ***,the wind intensity often increases two-to threefold,creating frequent high-speed winds that lead to severe sand damage along the HSR.(2)In the Gobi areas with extremely strong winds,sand grains can be lifted as high as 9 m from the ground into the air,far higher than in other areas of the *** sand transport rate decreases exponentially with increasing *** wind speed and particle size determine saltation *** particles and stronger winds provide the particles with a higher kinetic energy as they collide with the *** the wind zones of Baili and Yandun,the analysed study areas,the saltation layer height of wind-blown sand/gravel exceeds 3 and 2 m,respectively.(3)Based on the above findings,recently emerging sand control materials,suitable for the areas of interest,were screened and ***,under the proposed principle of‘supplementing blocking with trapping’,a comprehensive sand control measure was established,featuring sandblocking belts comprised of multiple rows,and high,vertical sand-trapping installations with a large grids *** installed system showed a high efficacy,reducing sand transport rate by 87.87%and significantly decreasing the deposition of sand along a trial section of the HSR.

关键词： Gobi areas with extremely strong winds Wind-blown sand hazards Complex terrain Sand/gravel flow Wind-blown sand control

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Determination of both jasmonic acid and methyl jasmonate in plant samples by liquid chromatography tandem mass spectrometry

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Chinese Science Bulletin 2010年第21期55卷 2231-2235页

作者： LIU Xia YANG YanLi LIN WanHuang TONG jianhua HUANG ZhiGang xiao LangTao Hunan Provincial Key Laboratory of Phytohormones and Growth Development Hunan Agricultural University Changsha 410128 China

An efficient method for the simultaneous extraction and quantification of both jasmonic acid(JA)and methyl jasmonate(MeJA) from a single plant sample was *** tissues were firstly extracted by using 100%cold methanol,then the Sep-pak C18 solid-phase extraction(SPE)cartridges were adopted for the purification of sample extract,and finally JA and MeJA were determined by the liquid chromatography tandem mass spectrometry(LC-MS-MS)*** was found that the accuracy was improved by using the extra standard for the estimation and correction of JA and MeJA losses in the extraction and purification *** detection limits for JA and MeJA were 0.03 and 0.075 ng mL-1,respectively,and the average recovery rate of JA and MeJA was 92.48%and 94.30%.The method was found to be reproducible and selective,yielding well isolated and easily detectable peaks for both JA and MeJA and simplifying the time-consuming extraction and ***-performance liquid chromatography(HPLC)system was employed as the control detection method for the LC-MS-MS *** two systems were compared in their specificity and accuracy.

关键词：高效液相色谱法茉莉酸甲酯串联质谱法植物样品测定同时提取 HPLC 提取纯化

Monitoring and early warning system of porcine pasteurellosis based on WebGIS

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Information Processing in Agriculture 2021年第1期8卷 148-158页

作者： Zihan Zhu Haoran Wang Li Gao Xiang Gao Xinghua Meng Yao Xu jianhua xiao Department of Veterinary Surgery Northeast Agricultural UniversityHarbin 150030China

The incidence of porcine pasteurellosis in China is so widespread that it is difficult to clearly understand the prevalence and maintain continuous *** order to reduce immense negative economic impact on the livestock industry;monitoring,early warning,and visual management systems are highly *** this study,a monitoring and early warning systemfor porcine pasteurellosis was established based onWeb Geographical Information System(WebGIS)*** establishing a path analysis function,buffer analysis function,and hot spot analysis function,it can provide a method of support and control of infectious *** early warning of disease,four common interpolation methods were tested,all of which showed that the affected area of porcine pasteurellosis in China was mainly concentrated in the south of the mainland.A cross-validation method was used to compare the four interpolation *** cross-validation showed that the inverse distance weighting(IDW)method was suitable for forecasting the occurrence of porcine pasteurellosis in ***,using C sharp(C#)as the development language and WebGIS technology,a monitoring and early warning system based on Browser/Server structure was *** is the first monitoring and early warning system of porcine pasteurellosis based *** performance of theWebGIS technology indicated a great potential for animal infectious disease applications and provided a foundation for future work.

关键词： Porcine pasteurellosis Monitoring and early warning Web geographical information system Inverse distance weighting

Optimization of gasoline hydrocarbon compositions for reducing exhaust emissions

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Journal of Environmental Sciences 2009年第9期21卷 1208-1213页

作者： SHEN Yitao,SHUAI Shijin,WANG Jianxin,xiao jianhua State Key Laboratory of Automotive Safety and Energy,Tsinghua University,Beijing 100084,China State Key Laboratory of Automotive Safety and Energy Tsinghua University

Effects of hydrocarbon compositions on raw exhaust emissions and combustion processes were studied on an engine test bench. The optimization of gasoline hydrocarbon composition was discussed. As olefins content increased from 10.0% to 25.0% in volume, the combustion duration was shortened by about 2 degree crank angle （°CA）, and the engine-out THC emission was reduced by about 15%. On the other hand, as aromatics content changed from 35.0% to 45.0%, the engine-out NOx emissions increased by 4%. An increment in olefins content resulted in a slight increase in engine-out CO emission, while the aromatics content had little effect on engine-out total hydrocarbon （THC） and CO emissions. Over the new European driving cycle （NEDC）, the THC, NOx and CO emissions of fuel with 25.0% olefins and 35.0% aromatics were about 45%, 21% and 19% lower than those of fuel with 10.0% olefins and 40.0% aromatics, respectively. The optimized gasoline compositions for new engines and new vehicles have low aromatics and high olefins contents.

关键词： optimization hydrocarbon composition exhaust emissions olefins aromatics

Experimental study on seismic reinforcement of bridge foundation on silty clay landslide with inclined interlayer

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Earthquake Engineering and Engineering Vibration 2024年第1期23卷 193-207页

作者： Lei Da xiao Hanmo Ran jianhua Luo Bin Jiang Guanlu Xue Tianlang College of Civil Engineering Sichuan Agricultural UniversityDujiangyan 611830China Sichuan Higher Education Engineering Research Center for Disaster Prevention and Mitigation of Village Construction Dujiangyan 611830China School of Civil Engineering Southwest Jiaotong UniversityChengdu 610031China

A shaking table test for a bridge foundation reinforced by anti-slide piles on a silty clay landslide model with an inclined interlayer was *** deformation characteristics of the bridge foundation piles and anti-slide piles were analyzed in different loading *** dynamic response law of a silty clay landslide with an inclined interlayer was *** spacing between the rear anti-slide piles and bridge foundation should be reasonably controlled according to the seismic fortification requirements,to avoid the two peaks in the forced deformation of the bridge foundation ***“blocking effect”of the bridge foundation piles reduced the deformation of the forward anti-slide *** stress-strain response of silty clay was intensified as the vibration wave field appeared on the *** the vibration intensified,the thrust distribution of the landslide underwent a process of shifting from triangle to inverted trapezoid,the difference in the acceleration response between the bearing platform and silty clay landslide tended to decrease,and the spectrum amplitude near the natural vibration frequency *** rear anti-slide piles were able to slow down the shear deformation of the soil in front of the piles and avoid excessive acceleration response of the bridge foundation piles.

关键词： silty clay landslide inclined interlayer shaking table test anti-slide pile bridge foundation pile

CVD growth of graphene on copper-plated scrap steel without external carbon source

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Nano Research 2023年第10期16卷 12263-12269页

作者： Tianyi Qi Qingguo Shao Hao Qi jianhua xiao Yuming Zhang Yang Wang Xin Jin Yanli Chen Dan Li xiaobei Zang Ning Cao School of Materials Science and Engineering State Key Laboratory of Heavy Oil ProcessingChina University of Petroleum(East China)Qingdao 266580China College of Chemistry and Chemical Engineering State Key Laboratory of Heavy Oil ProcessingChina University of Petroleum(East China)Qingdao 266580China School of Optoelectronic Science and Engineering University of Electronic Science and Technology of ChinaChengdu 611731China Qingdao Fengdong Heat Treatment Company Qingdao 266108China

Chemical vapor deposition(CVD)using gaseous hydrocarbon sources has shown great promise for large-scale graphene growth,but high growth temperatures(typically 1000℃)require sophisticated and expensive equipment,which increases graphene production ***,we demonstrate a new approach to produce graphene at low cost from scrap steel sheets treated by thermal evaporation of copper plating,which is a derivative of traditional CVD *** additional carbon sources,graphene film was successfully prepared on copper-coated scrap steel sheets at 820℃.The resulting graphene has few defects and uniform morphology,comparable to CVD graphene grown at 1000℃.Finally,the obtained graphene film is used in combination with an interdigital electrode to detect NO_(2)successfully,showing excellent *** technology expands the application of graphene in the manufacture of gas sensing devices and is compatible with traditional microelectronics technology.

关键词： graphene reuse of scrap steel C atoms activation H_(2)etching copper catalysis gas sensing

A flexible artificial solid-electrolyte interlayer supported by compactness-tailored carbon nanotube network for dendrite-free lithium metal anode

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Journal of Energy Chemistry 2022年第6期31卷 421-427,I0012页

作者： Haowen Liu Jifang Zhang Yang Liu Yang Wei Shuaiyang Ren Ludi Pan Yi Su jianhua xiao Haiyan Fan Yitao Lin Yipeng Su Yuegang Zhang State Key Laboratory of Low-Dimensional Quantum Physics and Department of Physics Tsinghua UniversityBeijing 100084China

A dendrite-free lithium metal anode requires a stable interface designed for efficient and reversible lithium plating and stripping. In this work, we have devised a mechanically flexible artificial Li_(3)N solid-electrolyte interlayer supported by a dual-layer compactness-tailored carbon nanotube fiber network. The more compact side of the network ensures a full coverage of Li_(3)N, which prevents the reaction between electrolyte and lithium. The other side, with sparsely distributed nanotube fibers, provides mechanical flexibility for the film, and induces three-dimensional lithium deposition along its structure without any dendrite formation. The resulting full cell with NCM811 cathode has a high capacity retention of 95.1% for 160 cycles compared with less than 80% for the control.

关键词： Lithium metal anode Artificial SEI CNT network 3D deposition

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纯电动汽车经济性驾驶的影响因素及应用

汽车工程学报 2024年第3期14卷 519-530页

作者：王颖迪李庆锋王师刘伟王博远肖建华广州汽车集团股份有限公司汽车工程研究院广州511434 清华大学车辆与运载学院北京100084

我国新能源汽车技术路线是以纯电驱动为主,随着纯电动汽车保有量的增加,降低其行驶能耗既符合国家节能减排的战略,又能改善用户的用车体验。基于某纯电动SUV车型的实际道路驾驶数据,通过相关性和降维分析得到加速度的方差是影响能耗的... 详细信息

我国新能源汽车技术路线是以纯电驱动为主,随着纯电动汽车保有量的增加,降低其行驶能耗既符合国家节能减排的战略,又能改善用户的用车体验。基于某纯电动SUV车型的实际道路驾驶数据,通过相关性和降维分析得到加速度的方差是影响能耗的最关键因素;进而采用一维模型仿真,研究匀速、加减速和坡道3种典型工况下能耗的形成机理和优化方向,得到平衡能耗与行驶时长的经济性驾驶原则,如高速巡航时应适当降低车速,市区拥堵时控制加速度变化幅度,上下坡时利用车辆惯性,减少制动能量回收。

关键词：纯电动汽车经济性驾驶能耗相关性分析降维分析

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智能家居系统中的家庭网站设计

计算机工程 2005年第8期31卷 206-208页

作者：肖健华五邑大学智能技术与系统研究所江门529020

家庭网站在智能家居系统中占有特殊的地位,它决定了整个系统中的网络家电和监控设备所必须遵循的共同标准。文章采用***来设计家庭网站,该网站具有友好的操作界面和良好的可扩充性。

关键词：智能家居系统家庭网站蓝牙 ***